たしか (tashika): If I remember correctly
～たしか (tashika)
Meaning
If I remember correctly
Formation and usage
たしか + clause
Notation: N = noun; V dictionary = dictionary-form verb; V stem = the stem before ます; plain clause = plain-form clause; negative stem = the form before ない. Follow the attachment shown above.
Explanation
Introduces a memory that is not fully certain; distinguish 確かに, which confirms or concedes a point.
Examples
たしか、会議は十時からだった。
If I remember correctly, the meeting was due to start at ten.
たしか、試験は十時からだった。
If I remember correctly, the exam was due to start at ten.
たしか、研修は十時からだった。
If I remember correctly, the training session was due to start at ten.
たしか、発表会は十時からだった。
If I remember correctly, the presentation event was due to start at ten.
たしか、面接は十時からだった。
If I remember correctly, the interview was due to start at ten.
How related patterns differ
どうやら and 模様だ infer from signs; おそらく predicts. に相違ない and に決まっている show strong confidence but are not evidence. ような気がする gives a subjective impression; たしか introduces an uncertain memory.